This sound is commonly associated with Sans from Undertale, the 2015 indie game by Toby Fox. Online, creators use it for the character’s blue eye glow in fan edits, versus videos and boss fight memes. Even when the exact audio varies between uploads, the idea stays the same: a tiny dramatic cue that signals danger, hidden power or a sudden shift in tone. Its popularity lasts because Sans remains one of the most recognizable game characters used in short-form edit culture.